Printing ink



Patented Oct. 22, 1935 UNITED STATES PATENT OFFICE N0 Drawing.Application March 29, 1934, Serial No. 718,086

2 Claims. (01. 134-36)- This invention relates to certain new and usefulimprovements in printing ink, the peculiarities of which will behereinafter fully described and claimed.

Heretofore, printing inks have been made by mixing the coloring matterwith a water-in-oil emulsion of mineral oil, water, and wool grease.Such inks have varied widely in the characteristics desired for use inlithography. My compound, composed of several known ingredients in theproportions hereinafter stated, when added to offset ink forlithographic printing, very notably improves such ink.

The main objects of my invention are to provide means first, to givefinish to the ink; second, to build up the body; third, to keep it frombleeding; fourth, to add to the covering power; and fifth, to makeimpressions stand out and increase the brilliancy thereof.

Practical use of my compound with ofiset ink in lithographic work hasdemonstrated its efficiency in attaining the above stated objects. Theingredients and preferred proportions are as follows:

4% parts of a synthetic resin in the form of a phenol-condensationproduct in the shape of a hard, rosin-like compound, such as Amberol" 4parts of China-wood oil 4 parts of wool grease These ingredients aremixed and heated in a suitable receptacle such as a kettle tillthoroughly dissolved, while being stirred continually. After being sotreated for two hours or less, the kettle with the compound is removedfrom the source of heat, and the stirring is continued while cooling,till the dark amber color changes to a straw color, similar to thechange in molasses candy being pulled. The bulk is increased about tenpercent; the consistency is that of cold molasses, and retains its strawcolor indefinitely.

If desired, some Wintergreen essence is stirred into the coolingcompound to give it a pleasant odor.

For use, this compound is added to offset ink for lithographic printingin the proportion of onehalf ounce up to two ounces of the compound,according to the brilliancy desired, to each pound of ofiset ink, andthoroughly mixed therewith by stirring, grinding or otherwise.

The functions of the above named ingredients in my compound, are asfollows;

The phenol-condensation product, such as Amberol, gives body to the inkand brilliancy of impressions.

China-wood oil brings the Amberol down to a fluid state of body.

Wool grease, or other suitable fatty ingredient, holds it to that bodydesired and reduces the tackiness so that it is more pliable.

This compound may also be used with letterpress ink by thinning it bythe addition of more China-wood oil in excess of four parts or othersuitable liquefying agent.

In use, my compound mixed with printing ink as stated, gives a finish tothe ink; keeps it from bleeding; will not liver the ink if it stands,which a #7 or #8 varnish will do under present usage; increases themileage of the ink; makes the ink stand up in relief on the surface ofthe sheet, andincreases the brilliancy of the same.

I do not confine my invention to the exact proportions herein stated.

I claim:

1. An improved printing ink for lithographic use consisting of an offsetink to which is added a compound composed of substantially four andone-half parts of a hard, rosin-like phenol-condensation product, 4parts China-wood oil as a liqueiying agent, and 4 parts wool grease as abody-holding fatty ingredient, and 4/ oz. to 2 oz. of said compoundbeing mixed with each pound of the offset ink according to thebrilliancy desired.

2. An improved printing ink for letter-press work consisting of aletter-press ink to which is added the herein described compoundcomposed of substantially 4 parts of a hard rosin-likephenol-condensatio-n product. China-wood oil in excess of 4 parts as aliquefying agent, and 4 parts of wool grease, said compound beingthinned to the desired consistency for letter-press work by adding moreliquefying agent, and then added to each pound of the letter-press inkin the proportion of oz. up to 2 oz.

AUGUST J. GAUTSCHE.

